Blasting apparatus



Patented Feb. 22;- 1921.

9 8 1. am 1 R H D u T M-l .I o S MA BE L 2 SHEETSSHEET I.

INVENTOR ;.'I.HOAR "m 962 ATTORNEYS" I Wmv 8858 ASTING APPARATUS. ATION FILED JUNE 18, 1919.

Patented Feb 22, 1921 s. T. HOAR. BL APPLIC 2 SHEETS-SHEET 2.

N xxx w lll I/Vl/HVTOR HOAR.

WI TN 8858 ATTORNEYS ToaZZ it may concern:

7 citizen of the United State's residingat'; Meaderville, in the county of Silver Bow smunr. TBUANHOAR, oFiunAnERv'ILLE, MoN'rAiwA Be it known that I, SAMUEL T. HoAR,"a

and .State of Montana, have invented new andu'seful Improvements in Blasting 'Apparatus', of which the following is a specification.,

.My'zinventionErel'ates to electr1cal apparatusfor use in blasting, or the like, and has particular reference to a switch adapted for closing a number of circuits for exploding 'zelect'ricprimers,and to improvements in the construction of such primers. 7

An important object of the invention is toirprovide an electric switch of the above mentioned 'char'actenby the employment of 'whichanumber of-charges may befi'red in proper order, and the charges vwhich fail a) explode indicated; v

*Af'urther object of the invention is'to provide a switch of the above mentioned character, which is simple in construction and reliable and convenient in use.

A further object of the invention is to provide an explosive charge which may becompletelyassembled before being distributed to the miner, so that all the miner .need do is=t0=place the same in the hole to be blasted and connect it in the circuit;

*A further object of the invention is toprovide an explosive charge device or primer, which may'beused in 'a' damp or wet hole without liability of failure in oper- -ation. I

"Other objects and-advantages of the m- 'vention will be apparent during the course :of the following -descri'ption.

In the accompanying drawings, forming :apart of cthis'specifica-tion, andin which like numerals are employed todesignate like parts throughoutthe same,

v Figure 1 is a side elevation ofa-s witch rembodying my invention, .45

Big. 2 isa similar viewof the switch, showing it connected with the circuits, (Fig. 3 is a longitudinal sectional view taken'on'line 33 of Fig. 1,

Fig. 4 is a horizontal transverse sectional view taken on line 4 -4 of Fig. 1, Fig.- 5 isa longitudinal sectional view through the exploding device or charge, showing the primer therein,

Fig. '6 is a detail section through the upper .end'of the primer,

. Specification of i'letters Patent.

11mm memes.

Patented-Febgzz, 1921. Application filed June is, 1919; Serial No. 305,043.

Fig. ;7 is a longitudinal section through I a charge. r

' .In the drawings, wherein for the purpose of illustration: is showna preferred embodi-' A transverse bar1 3-is rigidly secured to- -the 'lower end of the support 10 and is preferably' formed of insulating materiah The bar '13 has transverse openings for the reception of connecting wires 15, which are secured to the binding posts 11. A signal "device, such as a l amp'or buzzer isconnected in wire 15. There may be any suitable .number-of theseconnecting wires, the same being preferably numbered by reference characters 16,applied upon the transverse bar 13. The reference characters 16 also indicate the number of the holes to be blasted, and to which the wires lead. The wires 15 have their lower ends projecting downwardly beyond thebar 13 so that other V covered by a strip 20 which may also be of insulating material, The stationary contacts '12 extend behind the bars 18 and are adapt- "ed'to be successively engaged by a movable co'ntact 21, carried upon the lower end of ja -slide 22,; operating within-the passage '19. The slide 22 may be formed of insulating material and amaindead'wire 23 extends longitudinally thereof, upon its outer side and is connected with the contact 21. This contact 21' may be a continuation or'end of the wire 23, such wire being passed through transverse openings 24. The upper. end of the wire 23 passes through a transverse opening 25, in the top of the slide 22. As shown in Fig; 3, when the slide is in the lowermost position the contact 21 is arranged beneath .the'ilowermost contact 12,

different formof exploding device or The wires 29 are connected with the wire sections 27 or 28, as shown.

These wires 29 have electrically actuated exploding devices or charges 30, connected in series therewith. These exploding devices will be described later.

The operation of'the apparatus thus far described is as follows i When the slide" 22 is elevated to the first position the contact 21 will engage the lower- 7 most contact 12, and circuits Wlll be closed wherepry the devices arranged within the holes 0. 1 will be exploded, these holes be- 7' ing indicated by the numerals 16. In these closed circuits, current flows through the wire 26, section 27 thereof, exploding device 30, wire 29, wire 15 in hole No. 1, lowermost contact 12, and through wire 23 back to the opposite pole of the source of current. The current also flows through the section 28 of the wire, the wire 29 in the other hole No. 1,

wire 15, contact 12, contact 21, and through wire 23 back to the opposite pole of the source of current. It is obvious that as the slide is elevated, the contact 21 is successively brought into engagement with the contacts 12, and closing one or two circuits, as the case may be, depending upon whether or not one or two wires 29 are connected with the two wires 15.

The exploding device 30, may be of the form shown in ig. 5, wherein the explodcharge 31 may be dynamite, the same being heldwithin a casing 32. This dynamite is provided with a longitudinal opening or bore 33, to receive a primer to be next described. 'This primer embodies an inner casing 34, having a longitudinal opening 35,

" for the reception of a powder train 36 or fuse. The numeral 37 designates ametallic element of high resistance, which is adapted 'to glow upon the passage of current therethrough." The metallic element 37 extends across the powder'train or fuse 36 and is adaptedto 'ignitethe same when the metalli c element blows. Wires 38 engage the ends of the element 37 and these wires are preferably bound to the casing 34 by a wrapping The wires 38 V are suitably connected with the wires 29 and 26, as is obvious. The

' lower end of the casing 34 is suitably connected with a blasting cap 40, which is ex- 36, leading thereto.

ploded by the ignitionof the powder train To protect the fuse'and cap 40 from the he lower I action of the water or moisture the same is arranged within a tube 41, whichmay be formed of rubber, paper or. like material. The ends ofthis tube project outwardly beyondthe fuse casing and cap and such ends are closed by water proofing material 42, which may be soap or grease. I However,

the tube 41 maybe omitted,- iffdesired.

The upper end of the outer casing 32 may be closed by a stopper 43, also serving to clamp the Wires 38 to'the casing 32, there being suitable slack in the portions of the wires 38 within the casing 32.

In Fig. 7 the numeral 44 designates an explosive charge, such as dynamite, held within a casing 45, the upper end of which projects above the same. The casing 45 receives the lower end of an upper casing 46,.

containing a fuse 47 of suitable length. The upper end of this fuse contains a heat resistance element similar to the element 37, to ignite the powder train of the fuse 47 This heat resistance element is connected with wires 48, corresponding to the wires 38.

The lower end of the fuse 47 is connected with a blasting cap 49, serving'to explode the charge 44, when it explodes. A stopper 50 closes the upper end of the casing 46, as shown.

It is obvious that either form of explosion.

device may be employed in connection with my improved switch, such device being exploded when the circuit is closed, as hereinabove described.

It is to be understood that the forms of my invention herewith shown and described are to be'taken as preferred examples of the same, and the various changes in the shape, size, and arrangement of parts, may be resorted to without departing from the spirit of my invention or the scope of the subjoined claims.

Having thus described my invention, I claim: 1 I

1. In a switch of the character described, a support, spaced contacts carried by the support, a pair of guide bars arranged upon the support and secured thereto. a cover strip secured to the guide bars, a slide arranged between the guide bars and having a pair of spaced apertures and a wire extending longitudinally of the slide and having its end portion passedthrough the apertures for formin a contact element, said contact element being adapted to successively engage said spaced contacts;

2. In a switch of the character described, a support, spaced contacts carried by the sup port, a slide of insulating material associated with the support and adapted to traverse the said contacts, said slide having a pair of spaced apertures, and a wire extending longitudinally of the slide-and having a portion passed through the apertures for formin a contact element, said contact element being adapted to successively engage the spaced contacts as the slide traverses said contacts, all as and for the purposes specified. 3. In a switch or" the character described, a support, spaced contacts carried by the support, a slide ofinsulating material associated with the support and adapted to traverse the said contacts, and a conductor extending longitudinally of the slide and insulated thereby for a portion of its length and having an exposed portion constituting a contact element, said contact element being adapted to successively engage said spaced contacts as the slide traverses the same, all as and for the purposes specified.

4. In a switch of the character described, a support, transverse pairs of binding posts carried by the support and arranged in spaced relation upon the upper side thereof,

ing posts, an apertured transverse bar secured to one end of the support, wires passlng through the apertures of the bar and secured port, said guide bars being spaced, a cover {strip secured to the guide bars, a slide arranged between the'guide bars and having a pair of "spaced apertures, a wire extending longitudinally of the slide and having its end portion passed through the apertures for forming a contact element, said contact element being adapted to successively engage the transverse contacts.

SAMUEL TRUAN- HOAB.

' transverse contacts connected with the biiid- 20 a 

